The Amazon's black ghost knifefish is able to swim in many different directions with the help of a special fin. It's also able to use a self-generated electric field to sense its surroundings. Now, researchers are trying to develop a robotic fish that's able to mimic these abilities.

Young pacific salmon, even with zero prior experience, will rush headlong to the marine feeding grounds frequented by their ancestors. That's because their inbuilt GPS helps them orient according to the Earth's magnetic field in the desired direction.